System Unit Cover Removal - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

5-2 Repair
When disassembling the system unit, follow these general rules.
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Disconnect all peripherals.
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When handling boards or chips, touch the system unit frame to discharge static
electricity.
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Do not disassemble parts other than those specified in the procedure.
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All screws are Phillips-head, unless otherwise specified.
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Label all removed connectors. Note where the connector goes and in what
position it was installed.
On completion of any reassembly, perform a power-on test (see Section 2, "Setup and
Operation"). If a fault occurs, verify that the reassembly was performed correctly.

System Unit Cover Removal

Remove the system unit cover as follows:
1. Turn off and unplug the system unit.
Disconnect the keyboard, mouse, monitor, and any other devices (such as a
2.
printer) connected to the rear of the system.
Label all cables to make reinstallation easier.
3. Remove the three thumb screws from the rear of the system unit (see Figure 5-1).
If you have installed a padlock on the back of the system, unlock the padlock and
remove it.
CAUTION: When handling boards or chips,
ground yourself to release static electricity.
WARNING: Before removing the system unit
cover, turn off the power and unplug the system
power cable. Power is removed only when the
power cable is unplugged.
CAUTION: Electrostatic discharge can damage
computer components. Discharge static
electricity by touching a metal object before you
remove the system unit cover.